Originally posted by AsianGirlLover:

I personally have a room full of signs that remind me what the names of other portals are, and I rename that 1 portal to take me there.

I just drop map markers with portal names, myself.

It's surprising (to me) how quickly I started filling the map with markers, once I figured out how to use them properly. If it feels too cluttered, you can right-click on the little icons where you select a map marker icon to drop, and it toggles the visibility of that type of map marker.

I use the "dot" to indicate resources (metals, berries, etc), the "T" to indicate spawners, the campfire to indicate "resting places" (shelter, bed, workbench, etc) and the house to indicate places with portals... and the house name is the same as the portal.

I keep a portal hub at the first base I make away from spawn, so nothing is ever farther than two hops away. The downside, of course, is that everything is two hops away... but it beats having to rename a portal every time I want to go somewhere.